Kellogg Co. is voluntarily recalling about 28 million boxes of Apple Jacks, Corn Pops, Froot Loops and Honey Smackscereals because an
unusual smell and flavor from the
packages' liners could make people ill, the company said Friday.

Kellogg
said about 20 people complained about the cereals, including five who
reported nausea and
vomiting. The
company said the potential for serious health problems is low.

Consumers
reported the cereal
smelled or tasted waxy or like metal or soap. Company spokeswoman J.
Adaire Putnam said some described it as tasting stale.

Kellogg is trying to identify the substance
on the liners that's causing the problem and is offering consumers
refunds in the meantime.

The products were distributed throughout the
U.S. and began arriving in stores in late March.

Only products with the letters "KN" following
the use-by date are included in the recall. Products in Canada are not
affected.